def test_create_drop_succeeeds(self):
cluster = get_cluster()
keyspace_ss = 'test_ks_ss'
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
management.create_keyspace_simple(keyspace_ss, 2)
self.assertTrue(keyspace_ss in cluster.metadata.keyspaces)
management.drop_keyspace(keyspace_ss)
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
with warnings.catch_warnings(record=True) as w:
management.create_keyspace(keyspace_ss, strategy_class="SimpleStrategy", replication_factor=1)
self.assertEqual(len(w), 1)
self.assertEqual(w[-1].category, DeprecationWarning)
self.assertTrue(keyspace_ss in cluster.metadata.keyspaces)
management.drop_keyspace(keyspace_ss)
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
keyspace_nts = 'test_ks_nts'
self.assertFalse(keyspace_nts in cluster.metadata.keyspaces)
management.create_keyspace_simple(keyspace_nts, 2)
self.assertTrue(keyspace_nts in cluster.metadata.keyspaces)
with warnings.catch_warnings(record=True) as w:
management.delete_keyspace(keyspace_nts)
self.assertEqual(len(w), 1)
self.assertEqual(w[-1].category, DeprecationWarning)
self.assertFalse(keyspace_nts in cluster.metadata.keyspaces)
def create_keyspace(
self,
keyspace,
session=None
):
settings = self.settings_dict
keyspace_default_settings = {
'durable_writes': True,
'strategy_class': SimpleStrategy.name,
'replication_factor': 3
}
keyspace_settings = settings.get(
'KEYSPACES', {}
).get(
keyspace, {}
)
keyspace_default_settings.update(keyspace_settings)
keyspace_settings = keyspace_default_settings
self.ensure_connection()
create_keyspace(
keyspace,
**keyspace_settings
)
def sync_cassandra():
from cassandra.cqlengine.management import sync_table, create_keyspace
from benchmark.feeds import UserFeed, TimelineFeed
create_keyspace('stream_framework_bench', 'SimpleStrategy', 3)
for feed_class in [UserFeed, TimelineFeed]:
timeline = feed_class.get_timeline_storage()
sync_table(timeline.model)
def test_create_drop_succeeeds(self):
cluster = get_cluster()
keyspace_ss = 'test_ks_ss'
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
management.create_keyspace_simple(keyspace_ss, 2)
self.assertTrue(keyspace_ss in cluster.metadata.keyspaces)
management.drop_keyspace(keyspace_ss)
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
with warnings.catch_warnings(record=True) as w:
management.create_keyspace(keyspace_ss,
strategy_class="SimpleStrategy",
replication_factor=1)
self.assertEqual(len(w), 1)
self.assertEqual(w[-1].category, DeprecationWarning)
self.assertTrue(keyspace_ss in cluster.metadata.keyspaces)
management.drop_keyspace(keyspace_ss)
self.assertFalse(keyspace_ss in cluster.metadata.keyspaces)
keyspace_nts = 'test_ks_nts'
self.assertFalse(keyspace_nts in cluster.metadata.keyspaces)
management.create_keyspace_simple(keyspace_nts, 2)
self.assertTrue(keyspace_nts in cluster.metadata.keyspaces)
with warnings.catch_warnings(record=True) as w:
management.delete_keyspace(keyspace_nts)
self.assertEqual(len(w), 1)
self.assertEqual(w[-1].category, DeprecationWarning)
self.assertFalse(keyspace_nts in cluster.metadata.keyspaces)
def sync_cassandra():
from cassandra.cqlengine.management import sync_table, create_keyspace
from benchmark.feeds import UserFeed, TimelineFeed
create_keyspace('stream_framework_bench', 'SimpleStrategy', 3)
for feed_class in [UserFeed, TimelineFeed]:
timeline = feed_class.get_timeline_storage()
sync_table(timeline.model)
def cassandra_setup():
from cassandra.cqlengine.management import create_table, create_keyspace
aggregated_timeline = AggregatedFeed.get_timeline_storage()
timeline = FashiolistaFeed.get_timeline_storage()
user_timeline = UserFeed.get_timeline_storage()
create_keyspace('test')
create_table(aggregated_timeline.model)
create_table(timeline.model)
create_table(user_timeline.model)
def cassandra_setup():
from cassandra.cqlengine.management import create_table, create_keyspace
aggregated_timeline = AggregatedFeed.get_timeline_storage()
timeline = FashiolistaFeed.get_timeline_storage()
user_timeline = UserFeed.get_timeline_storage()
create_keyspace('test')
create_table(aggregated_timeline.model)
create_table(timeline.model)
create_table(user_timeline.model)
def get_column_family(
connection,
model
):
connection_settings = connection.settings_dict
if hasattr(model, 'Cassandra'):
cassandra_settings = model.Cassandra.__dict__
else:
cassandra_settings = default_cassandra_model_settings
if hasattr(cassandra_settings, 'keyspace'):
keyspace = cassandra_settings.keyspace
else:
keyspace = connection_settings.get('DEFAULT_KEYSPACE')
keyspace_settings = connection_settings.get('KEYSPACES', {}).get(keyspace)
if None is keyspace_settings:
keyspace_settings = {} # Replace with default keyspace settings.
replication_factor = keyspace_settings.get(
'replication_factor',
)
replication_strategy_class = keyspace_settings['strategy_class']
create_keyspace(
keyspace,
replication_strategy_class,
replication_factor
)
table_options = default_table_options
if hasattr(cassandra_settings, 'table_options'):
if not isinstance(cassandra_settings.table_optoins, dict):
raise DatabaseError(
'The value of table_optoins in the Cassandra class '
'must be a dict containing overrides for the default'
'column family options.'
)
table_options.update(cassandra_settings.table_metadata)
return type(
str(model._meta.db_table),
(CqlColumnFamily,), {
'__model__': model,
'table_options': table_options
}
)
def setup(self, collection):
"""
:param collection:
:return:
"""
connection.setup([CASSANDRA_1], collection)
management.create_keyspace(
collection,
replication_factor=1,
strategy_class='SimpleStrategy',
)
TestModel.__keyspace__ = collection
management.sync_table(TestModel)
def setup(self, collection):
"""
:param collection:
:return:
"""
connection.setup([CASSANDRA_1], collection)
management.create_keyspace(
collection,
replication_factor=1,
strategy_class='SimpleStrategy',
)
TestModel.__keyspace__ = collection
management.sync_table(TestModel)
def setup(self, force=False, throw=False):
if self._setup and not force:
return True
try:
connection.setup(self.uri, self.keyspace)
management.create_keyspace(self.keyspace, replication_factor=1, strategy_class='SimpleStrategy')
for model in self._models:
model.__keyspace__ = self.keyspace
management.sync_table(model)
except NoHostAvailable:
logger.error('Could not connect to Cassandra, expect errors.')
return False
# Note: return values are for test skipping
self._setup = True
return True
def setUp(self):
class MyModel(Model):
id = columns.Text(max_length=63,
primary_key=True,
default=lambda: str(uuid.uuid4()))
value = columns.Text(max_length=63)
self.model = MyModel
connection.setup(['127.0.0.1'], self.keyspace)
create_keyspace(self.keyspace,
strategy_class='SimpleStrategy',
replication_factor=1)
sync_table(MyModel)
class MyManager(CQLManager):
model = self.model
fields = (
'id',
'value',
)
create_fields = ('value', )
update_fields = ('value', )
self.manager_class = MyManager
def connect():
setup(["127.0.0.1"], "videos")
management.create_keyspace('videos', 'SimpleStrategy',replication_factor=1)
from sys import path
path.append(".")
from cassandra.cqlengine.management import sync_table, create_keyspace
from killranalytics.models import connect_cassandra, PageViews, RealTimeData
connect_cassandra()
ks = 'killranalytics'
create_keyspace(ks, "SimpleStrategy", 1)
sync_table(PageViews)
sync_table(RealTimeData)
print "done"
import uuid
from cassandra.cqlengine import columns
from cassandra.cqlengine import connection
from datetime import datetime
from cassandra.cqlengine.management import sync_table, create_keyspace
from cassandra.cqlengine.models import Model
##Configuration--------
keyspace="octalspace"
connection.default()
create_keyspace(keyspace, replication_factor=1, strategy_class="SimpleStrategy")
connection.setup(['127.0.0.1'], keyspace, protocol_version=3)
##/Configuration-------
class Account(Model):
pk = columns.UUID(primary_key=True)
created_at = columns.DateTime()
username = columns.Text()
'''
So, how do you do tree data models in cassandra? It is a mystery
My initial thought is that the top level post object, (a self post or a link)
has a list of *all* it's children. That way we can do a batch read and get an entire page.
Well mostly, one for the object, and once for all of it's descendents
That use case is going to be the vast majority of our data stuff, getting a top level post and *all* descendents.
For displaying it as a tree, we'd need to have each comment contain a list (well, unordered set) of it's immediate children.
def connect():
setup(["127.0.0.1"], "videos")
management.create_keyspace('videos',
'SimpleStrategy',
replication_factor=1)
